`1` You don't need to tip in Viet Nam

`->` Cấu trúc : S + do/does + not + need + to V

`2` We have the custom of having fireworks on New Year's Eve

`->` Cấu trúc : S + have the custom + of + V_ing

`3` I like the Giong Festival, but I have never been there

`->` Liên từ ''but'' dùng để dùng để diễn tả sự đối lập, ngược nghĩa

`4` All the students love the principal because he is very kind

`->` Cấu trúc : Because + S + V : bởi vì...

=>
1. You don't need to tip in Viet Nam.
-> don't need to V : không cần làm gì
2. We have the custom of having fireworks on New Year's Eve.
-> have the custom of Ving : có phong tục làm gì
3. I like the Giong Festival, but I have never been there.
-> but : nhưng
4. All the students love the principal because he is very kind.
-> because : bởi vì